exam Maths Puzzle Numerical Ability

r-3 is this a exponent.

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exam Other Question

The measures of the angles of four-sided figure can be represented by x,x,5x, and 4x-3, find the measure of each angle. how do i solve this?
6x to the 2nd power y to the 3rd + 9x to the 2nd power y to the 3rd over 3x to the 2nd power y to the 2nd power